643299341 has 2 divisors, whose sum is σ = 643299342. Its totient is φ = 643299340.

The previous prime is 643299277. The next prime is 643299343. The reversal of 643299341 is 143992346.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 593653225 + 49646116 = 24365^2 + 7046^2 .

It is a cyclic number.

It is not a de Polignac number, because 643299341 - 2⁶ = 643299277 is a prime.

Together with 643299343, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (643299343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321649670 + 321649671.

It is an arithmetic number, because the mean of its divisors is an integer number (321649671).

Almost surely, 2^643299341 is an apocalyptic number.

It is an amenable number.

643299341 is a deficient number, since it is larger than the sum of its proper divisors (1).

643299341 is an equidigital number, since it uses as much as digits as its factorization.

643299341 is an evil number, because the sum of its binary digits is even.

The product of its digits is 139968, while the sum is 41.

The square root of 643299341 is about 25363.3464077594. The cubic root of 643299341 is about 863.2522165886.

The spelling of 643299341 in words is "six hundred forty-three million, two hundred ninety-nine thousand, three hundred forty-one".